Shelf bracket 150mm - v2
Vastly improved version of the first one, fillets in corners, stiffening rib across the front, triangular piercings with radiused corners, altogether much better.
Even has holes in for the screwdriver through the front rib.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/gFylRRdVFy2